Publications by authors named "Mengda Liu"

Introduction: Brucellosis, an infectious zoonotic disease caused by members of the genus , results in chronic multi-organ injury. Improving the specificity and sensitivity of serological methods for diagnosing brucellosis necessitates the development of novel diagnostic antigens. The twin-arginine translocation (Tat) pathway is responsible for transporting folded proteins across the cytoplasmic membrane and has been implicated in the virulence of .

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BP26 proves to be a highly immunogenic antigen with excellent specificity in brucellosis detection. In China, the authorized use of the Bp26-deleted vaccine M5ΔBP26 for preventing small ruminant brucellosis highlights the importance of developing accurate detection methods targeting BP26, particularly for the diagnosis of differentiation between infected and vaccinated animals (DIVA). Using the traditional mouse hybridoma technique, we successfully obtained 12 monoclonal antibodies (mAbs) targeting BP26.

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Article Synopsis
  • Tuberculosis caused by Mycobacterium tuberculosis complex (MTBC) remains a major global health issue, emphasizing the need for effective detection methods to differentiate its main pathogens.
  • The study introduces a new testing method called triplex droplet digital polymerase chain reaction (ddPCR), which uses different probe fluorophores to accurately target genes associated with three pathogens: MTBC, its variants, and BCG.
  • The results show that triplex ddPCR is more sensitive and specific than current methods, detecting lower levels of pathogens in various sample types (including milk, tissue, and swabs) with high repeatability and without cross-reaction to other organisms.
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The utilization efficiency of ozone determines the cost of catalytic ozonation in water treatment. Herein, a triphase catalytic system was constructed by aerating ozone through a CeO loaded AlO ceramic membrane (CeO-CM) for disinfection and antibiotic degradation. Ozone aeration and a packed catalyst system (CeO-Packing) were set as the controls.

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In recent years, the poultry industry had been markedly affected by adenoviral diseases such as hydropericardium syndrome and inclusion body hepatitis caused by fowl adenovirus (FAdV), which have become increasingly prevalent in China. Shandong Province, China, is an important area for poultry breeding where various complex and diverse FAdV serotypes were isolated. However, the dominant strains and their pathogenic characteristics are not yet reported.

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Mineral elements and antibiotic-resistant bacterial pollutants in livestock and poultry farms' wastewater are often sources of ecological and public health problems. To understand the heavy-metal pollution status and the characteristics of drug-resistant Escherichia coli (E. coli) in swine-farm wastewater in Shandong Province and to provide guidance for the rational use of mineral-element additives, common antibiotics, and quaternary ammonium compound disinfectants on swine farms, 10 mineral elements were measured and E.

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Responsible for the acute infectious disease porcine epidemic diarrhea (PED), PED virus (PEDV) induces severe diarrhea and high mortality in infected piglets and thus severely harms the productivity and economic efficiency of pig farms. In our study, we aimed to investigate and analyze the recent status and incidence pattern of PEDV infection in some areas of Shandong Province, China. We collected 176 clinical samples of PED from pig farms in different regions of Shandong Province during 2019-2021.

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Since the rise of porcine reproductive and respiratory syndrome virus (PRRSV) in China, mutations have occurred regularly. In particular, the emergence of HP-PRRSV has significantly improved the pathogenicity of PRRSV. It has brought huge economic losses to the Chinese pig farming industry.

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Tuberculosis caused by the complex (MTBC) has become one of the leading causes of death in humans and animals. Current research suggests that the transmission of MTBC in the environment indirectly transmit to humans and animals with subsequent impact on their wellbeing. Therefore, it is of great significance to take One Health approach for understanding the role of MTBC in not only the interfaces of humans and animals, but also environment, including soil, water, pasture, air, and dust, etc.

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Background: Brucellosis is one of the most important zoonotic diseases in the world. Canine brucellosis, caused mainly by , is seriously neglected, and there is a lack of accurate diagnostic tools.

Methods: In this study, to compare BP26, Omp25, Omp31 and a multiepitope-based fusion protein in the serological detection of canine brucellosis, using 34 brucellosis-positive dog sera and 62 negative control sera, the outer membrane proteins Omp31, BP26, Omp25 and a multiepitope-based fusion protein were evaluated by iELISA for their potential use as antigens in the serological diagnosis of canine brucellosis.

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Article Synopsis
  • A study was conducted to assess the presence of avian hepatitis E virus (HEV) in healthy chickens across 12 farms in Tai'an City, China, where researchers collected cloacal swabs and yolk samples.
  • The results showed positive rates for HEV in cloacal swabs (6.25%) and yolk samples (4.51%), with higher rates found in chicks (11.67%) and various stages of embryos from breeder farms, indicating potential vertical transmission.
  • Genetic analysis revealed the isolated strains were distinct, with 76.4% to 83.9% nucleotide homology to existing genotypes, suggesting the presence of novel genotypes of avian HEV in the area.
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Klebsiella pneumoniae (K. pneumoniae) is a conditionally pathogenic bacterium present in the intestinal or the respiratory tract of animals, and it is a common factor in acquired infections and a major threat to public health. Increased production of extended-spectrum β-lactamases (ESBLs) has become a serious issue in the treatment of K.

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Enterococcus faecalis (E. faecalis) is a zoonotic pathogen that causes severe economic losses in the poultry-breeding industry. In our study, cecal samples from broilers with cecal enlargement at slaughterhouses in Tai'an, China, were analyzed.

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Animal-derived Proteus mirabilis (P. mirabilis) is an important food-borne zoonotic bacillus and widely exists in the broiler-breeding industry. The present study was designed to explore the P.

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  () is an important intracellular pathogen that poses a health threat to humans. This study tries to clarify the mechanism of survival and reproduction in the host. In this study, high-throughput sequencing analysis was performed on RNA extracted from the strains isolated from infected mouse spleens and an reference strain (ATCC 14028) based on the BGISEQ-500 platform.

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Background: Blackened intestines in slaughtered pigs have been commonly observed in China in recent years. However, no cause has been reported.

Objectives: We attempted to determine whether the blackening of the pig intestine was related to an excess of copper (Cu) in their feed.

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The extensive use of antibiotics has, in recent years, caused antimicrobial resistance and multidrug resistance in Escherichia coli to gradually develop into a worldwide problem. These resistant E. coli could be transmitted to humans through animal products and animal feces in the environment, thereby creating a problem for bacterial treatment for humans and animals and resulting in a public health issue.

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Background: Porcine circovirus type 2 (PCV2) is one of the crucial swine viral pathogens, caused porcine circovirus associated diseases (PCVAD). Shandong province is one of the most important pork producing areas and bears a considerable economic loss due to PCVAD. However, there is limited information on epidemiology and coinfection rate of PCV2 with other critical swine diseases in this area, such as porcine reproductive and respiratory syndrome virus (PRRSV), classical swine fever virus (CSFV), Pseudorabies virus (PRV), and porcine epidemic diarrhea virus (PEDV).

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HoBi-like pestivirus is an emerging atypical pestivirus in cattle and small ruminants, causing clinical signs similar to those observed in bovine viral diarrhoea virus infections. Natural infection of HoBi-like pestivirus has been reported in cattle herds and small ruminants in multiple countries in South America, Europe and Asia. However, HoBi-like pestiviruses were only identified from contaminated bovine serum and small ruminants in China.

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Porcine circovirus type 3 (PCV3) is a new member of Circovirus, which could cause various symptoms in infected pigs. It has been reported in many countries and detected from various animals. This study retrospectively analyzed serum samples that were randomly collected from 1,499 clinically healthy cattle in Shandong province from 2011 to 2018.

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Background: Marek's disease (MD) is a chicken neoplastic disease, which brings huge economic losses to the global poultry industry. The wild type p53, a tumor suppressor gene, plays a key role in blocking cell cycle, promoting apoptosis, and maintaining the stability of the genome. However, the mutant p53 losses its tumor inhibitory role and become an oncogene when a mutation has happened.

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Brucellosis is one of the major zoonotic diseases in the world. In China, understanding on its causative agent Brucella is still limited. Recently, we isolated a Brucella strain XZ19-1 from yak in Lhasa, Tibet.

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Background: Pseudorabies, also known as Aujeszky's disease, is caused by the pseudorabies virus (PRV) and has been recognized as a critical disease affecting the pig industry and a wide range of animals around the world, resulting in great economic losses each year. Shandong province, one of the most vital food animal-breeding regions in China, has a very dense pig population, within which pseudorabies infections were detected in recent years. The data, however, on PRV epidemiology and coinfection rates of PRV with other major swine diseases is sparse.

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Pseudorabies (PR) is a highly contagious disease affecting a wide range of animals, which annually causes great economic losses in China. In this study, a total number of 18,815 serum samples and 1,589 tissue samples were collected from 311 intensive pig farms (≥350 sows) located in eight cities in Heilongjiang province, and tested by ELISA and PCR. Overall, the serum positive rates of gE and gB protein were 16.

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Paratuberculosis, a chronic and sometimes fatal disease of ruminants, is caused by subsp. (MAP). In this study, we examined paratuberculosis cases among 2-4-year-old dairy cows at farms in Shandong Province, China.

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